diff --git a/blueprintcompiler/main.py b/blueprintcompiler/main.py
index 1c3a1c6..b51a00c 100644
--- a/blueprintcompiler/main.py
+++ b/blueprintcompiler/main.py
@@ -39,8 +39,7 @@ LIBDIR = None
 class BlueprintApp:
     def main(self):
         self.parser = argparse.ArgumentParser()
-        self.subparsers = self.parser.add_subparsers(metavar="command")
-        self.parser.set_defaults(func=self.cmd_help)
+        self.subparsers = self.parser.add_subparsers(metavar="command", required=True)
 
         compile = self.add_subcommand(
             "compile", "Compile blueprint files", self.cmd_compile